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SMPS converters ease low-power directive compliance

Posted: 14 May 2009 ?? ?Print Version ?Bookmark and Share

Keywords:SMPS converters? standby power? family converter?

SMPS converters

STMicroelectronics has introduced the VIPerPlus family of off-line switched-mode power supply (SMPS) converters. Following the introduction of the first device, VIPer17, in 2008, ST has added the VIPer15/16/25/27/28 devices to form a broad family of AC/DC converters that minimize both standby power consumption and the number of external components required, while enabling easy compliance with Blue Angel, Energy Star and other low-power norms and directives.

The family is ideal for energy-saving power supplies operating from all mains voltages worldwide in home appliancesfrom coffee makers to washing machines and dishwashers, consumer equipment such as LCD TVs, DVD players and STBs, domestic and architectural lighting, auxiliary supplies for desktop PCs and servers, and chargers for mobile phones, digital cameras, portable audio players, toys and cordless appliances such as shavers.

All VIPerPlus devices include the controller, the startup circuitry and an 800V avalanche-rugged power MOSFET in the package. New integrated functions and high break-down voltage help to improve the robustness and the reliability of the power supplies, reduce the external component count, and provide both higher efficiency in operating mode and an ultra-low standby power consumption that is less than 50mW at 265V and can be reduced to 30mW with optimized transformer design.

The 800V avalanche-rugged power MOSFET is specifically optimized for the VIPerPlus. The fixed-frequency PWM controller with jittering, and the quasi-resonant innovative topology, maximize the efficiency in operating mode while reducing the EMI filter costs. Its standby power allows customers to meet the most demanding energy-saving regulations, while protection features include accurate, adjustable over-voltage and overload protection, hysteretic over-temperature protection, two levels of over-current protection and open loop failure disconnection.

By integrating a high-voltage startup-current generator and essential drain-current control during the converter startup phase, VIPerPlus eliminates the need for a startup resistor, reduces stress on the secondary diode and helps to prevent transformer saturation. The embedded SenseFET eliminates external sensing components, allowing a precise drain-current limit. Detection of a fault initiates the devices' auto-restart function, which prevents damage to the power supply or the load.

All members of the VIPerPlus family are available in volume quantities in DIP-7 or SO16N packages, with pricing from $0.37 to $0.60 in quantities of 10,000 units.





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